Ugh. Remember when you could search for a video on youtube and it was just a page full of results? I remember.
I had this same issue recently when I searched for something innocuous (ways to put up my long hair in a bun) and was served clickbait shock videos of anorexic women and other nonsense.
You are getting plenty of amazing advice on fathering from other dads here, but I wanted to pop in with a suggestion regarding youtube.
After that last interaction with youtube I ended up down the rabbit hole looking for a fix. I tried a few browser addons but none seemed to work properly, but then I heard about youtube front ends.
This one is "invidious"

And this one is "piped"

In both you connect to an "instance" like lemmy does, which can impact their performance. I haven't chosen my favourite yet, invidious seems to perform better sometimes, but I like the ui of piped.
Congratulations to you and your growing family. <3
Edit: Here is a bonus screengrab with your search terms, there is still a lot of "how to have a boy" stuff, but some videos with general advice, being supportive, and fertility in general.

